afs opened a new issue, #3855:
URL: https://github.com/apache/jena/issues/3855

   `\u{...}` is an escape sequence for  Unicode codepoints in JavaScript, Ruby 
and Rust. The `...` is 1 to 6 hex digits for the Uncode integers 0 to 0x10FFFF 
(the limit of Unicode; limited by the UTF-16 surrogate pair range).
   
   It still has to be a legal codepoint.
   
   W3C i18n [suggests this for hex 
escapes](https://github.com/w3c/rdf-turtle/issues/130) -- The RDF & SPARQl WG 
has [not adopted 
it](https://github.com/w3c/rdf-turtle/issues/130#issuecomment-4216017178).
   
   RDF Turtle-family and SPARQL use the Python style `\u` and `\U`.
   
   Do <ins>***not***</ins> write this escape form!
   
   Jena can be made to ingest this form.
   
   More:
   https://www.w3.org/TR/international-specs/#char_esc_new
   


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